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7990 bottlenecked by FX-8350 due to vdroop. PSU or Mobo?

#1TheFeshPincePosted 8/22/2013 4:39:49 PM
Specs:

FX-8350 OCed to 4.6ghz
Asus M5A97 R2.0
16GB RAM
Sapphire 7990
Corsair CX750M

This is definitely vdroop and not vdrop. Basically, in game, the voltage delivered to CPU is around 1.4v and then will drop to around .9v during heavy CPU intensive gameplay. At that time, the fps is around 10-15fps, when just a moment ago it was over 100fps.

I have disabled APM Master Mode and all other power saving options in BIOS as well as enabling LLC. None of these changes have made a difference. I still get vdroop eventually. Some of these options enabled or disabled can make the vdroop occur more often, but either way it happens.

I just want to know if this is due to the PSU or the Mobo? I've tested PSU with multimeter and it seems stable. I'm leaning towards this being a problem with the motherboard.
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http://i.imgur.com/J0lvB6S.jpg | http://i.imgur.com/DoHj9yA.jpg | http://youtu.be/YXkx-PSwbG4
#2PathlessBulletPosted 8/22/2013 4:49:18 PM
Should've went Intel!


lawlz lawlz lawlz
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ADD, no. Where is the thread for Fallout OCD players?
"We have to keep it on page 3 or it freaks out."
#3TheFeshPince(Topic Creator)Posted 8/22/2013 4:50:45 PM
PathlessBullet posted...
Should've went Intel!


lawlz lawlz lawlz


It's true... :(
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http://i.imgur.com/J0lvB6S.jpg | http://i.imgur.com/DoHj9yA.jpg | http://youtu.be/YXkx-PSwbG4
#4DerPancakePosted 8/22/2013 4:52:35 PM
TheFeshPince posted...
PathlessBullet posted...
Should've went Intel!


lawlz lawlz lawlz


It's true... :(


Intel > AMD, cannot say the same thing for NVIDA anymore though.
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i7-4770k | EVGA GeForce GTX770 2GB | Asus Sabertooth Z87 | Corsair Vengeance 8GB RAM
Samsung 840 120GB SSD | CM Storm Enforcer | Corsair TX 750 Watt
#5TheFeshPince(Topic Creator)Posted 8/22/2013 4:55:39 PM
I'm pretty sure it's not the CPU, though. It seems to be a problem with the power phases on the mobo.
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http://i.imgur.com/J0lvB6S.jpg | http://i.imgur.com/DoHj9yA.jpg | http://youtu.be/YXkx-PSwbG4
#6Snuckie7Posted 8/22/2013 4:56:12 PM
TheFeshPince posted...
Specs:

FX-8350 OCed to 4.6ghz
Asus M5A97 R2.0
16GB RAM
Sapphire 7990
Corsair CX750M

This is definitely vdroop and not vdrop. Basically, in game, the voltage delivered to CPU is around 1.4v and then will drop to around .9v during heavy CPU intensive gameplay. At that time, the fps is around 10-15fps, when just a moment ago it was over 100fps.

I have disabled APM Master Mode and all other power saving options in BIOS as well as enabling LLC. None of these changes have made a difference. I still get vdroop eventually. Some of these options enabled or disabled can make the vdroop occur more often, but either way it happens.

I just want to know if this is due to the PSU or the Mobo? I've tested PSU with multimeter and it seems stable. I'm leaning towards this being a problem with the motherboard.


I can quite assure you that your CPU core voltage is not dropping 500mV under load due to vDroop. Something else with the voltage regulation is up. Make sure you applied everything correctly in the BIOS, check for updates too.
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Intel Core i7 3820 | EVGA X79 SLI K2 | MSI 7950 Twin Frozr III | Samsung / 840 120GB / 8GB RAM | 1TB WD Caviar Blue | Corsair / 550D / H70 | Silencer MKIII 600W
#7TheFeshPince(Topic Creator)Posted 8/22/2013 5:00:42 PM
Snuckie7 posted...
TheFeshPince posted...
Specs:

FX-8350 OCed to 4.6ghz
Asus M5A97 R2.0
16GB RAM
Sapphire 7990
Corsair CX750M

This is definitely vdroop and not vdrop. Basically, in game, the voltage delivered to CPU is around 1.4v and then will drop to around .9v during heavy CPU intensive gameplay. At that time, the fps is around 10-15fps, when just a moment ago it was over 100fps.

I have disabled APM Master Mode and all other power saving options in BIOS as well as enabling LLC. None of these changes have made a difference. I still get vdroop eventually. Some of these options enabled or disabled can make the vdroop occur more often, but either way it happens.

I just want to know if this is due to the PSU or the Mobo? I've tested PSU with multimeter and it seems stable. I'm leaning towards this being a problem with the motherboard.


I can quite assure you that your CPU core voltage is not dropping 500mV under load due to vDroop. Something else with the voltage regulation is up. Make sure you applied everything correctly in the BIOS, check for updates too.


I updated to the most recent BIOS and the problem continues. I'm pretty sure it really is dropping 500mV... I have HWMonitor and AI Suite II saying the same thing when this happens... the sluggishness is unbearable, but it only lasts for about 5 seconds and then jumps back to regular voltages and runs fine until it happens, again. Do you think it's the mobo or PSU or any other suggestions?
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http://i.imgur.com/J0lvB6S.jpg | http://i.imgur.com/DoHj9yA.jpg | http://youtu.be/YXkx-PSwbG4
#8Snuckie7Posted 8/22/2013 5:03:08 PM
Sounds like more of a problem with the motherboard being unable to force constant voltage than vDroop.
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Intel Core i7 3820 | EVGA X79 SLI K2 | MSI 7950 Twin Frozr III | Samsung / 840 120GB / 8GB RAM | 1TB WD Caviar Blue | Corsair / 550D / H70 | Silencer MKIII 600W
#9TheFeshPince(Topic Creator)Posted 8/22/2013 5:05:26 PM
Snuckie7 posted...
Sounds like more of a problem with the motherboard being unable to force constant voltage than vDroop.


Gotcha. I wasn't sure what to call it.
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http://i.imgur.com/J0lvB6S.jpg | http://i.imgur.com/DoHj9yA.jpg | http://youtu.be/YXkx-PSwbG4
#10GreenMage7Posted 8/22/2013 5:16:08 PM(edited)
Don't listen to unhelpful people. You have probably overclocked your processor more than your board and CPU cooler can handle. How long did you run Prime 95 or AIDA64 before you determined your overclock was stable? A lot of people have problems overclocking high on that board.

My suggestion is to get back to stock and make sure you're not having problems.

This guide is god-mode for overclocking FX processors on Asus boards:

http://www.overclock.net/t/1348623/amd-bulldozer-and-piledriver-overclocking-guide-asus-motherboard

Just make sure you run the stress tests properly.